“Lip synching is difficult!” one user wrote. While others chimed in with similar comments including, “lip synch of life” and “oops y’all forgot to put the mic up!”

As Radar reported, Spears faced similar allegations earlier this month when a video emerged that showed her vocal track continuing undisturbed when her mic pack went flying off her body during a dance routine.

At the time, her rep did not respond to Radar’s request for comment. But months ago, they insisted that her show would be the real thing.

“Britney Spears will be singing live during her show (and) she will not be ‘lip-synching,’” her rep said, even though Spears’ manager Larry Rudolph was quoted before the show as saying, “There might be some numbers where she’s full out dancing with a (vocal) track underneath her, but there won’t be any lip-syncing across the board on anything.”